Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| John Johansen |
359 |
84.07% |
4 |
36.36% |
| Tyler Hicks |
29 |
6.79% |
1 |
9.09% |
| SF Markus Elfring |
11 |
2.58% |
1 |
9.09% |
| Nicolas Iooss |
10 |
2.34% |
1 |
9.09% |
| Arnd Bergmann |
8 |
1.87% |
1 |
9.09% |
| Kees Cook |
7 |
1.64% |
1 |
9.09% |
| Thomas Gleixner |
2 |
0.47% |
1 |
9.09% |
| Eric Biggers |
1 |
0.23% |
1 |
9.09% |
| Total |
427 |
|
11 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* AppArmor security module
*
* This file contains AppArmor policy loading interface function definitions.
*
* Copyright 2013 Canonical Ltd.
*
* Fns to provide a checksum of policy that has been loaded this can be
* compared to userspace policy compiles to check loaded policy is what
* it should be.
*/
#include <crypto/hash.h>
#include "include/apparmor.h"
#include "include/crypto.h"
static unsigned int apparmor_hash_size;
static struct crypto_shash *apparmor_tfm;
unsigned int aa_hash_size(void)
{
return apparmor_hash_size;
}
char *aa_calc_hash(void *data, size_t len)
{
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
char *hash;
int error;
if (!apparmor_tfm)
return NULL;
hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
if (!hash)
return ERR_PTR(-ENOMEM);
desc->tfm = apparmor_tfm;
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) data, len);
if (error)
goto fail;
error = crypto_shash_final(desc, hash);
if (error)
goto fail;
return hash;
fail:
kfree(hash);
return ERR_PTR(error);
}
int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
size_t len)
{
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
int error;
__le32 le32_version = cpu_to_le32(version);
if (!aa_g_hash_policy)
return 0;
if (!apparmor_tfm)
return 0;
profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
if (!profile->hash)
return -ENOMEM;
desc->tfm = apparmor_tfm;
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) start, len);
if (error)
goto fail;
error = crypto_shash_final(desc, profile->hash);
if (error)
goto fail;
return 0;
fail:
kfree(profile->hash);
profile->hash = NULL;
return error;
}
static int __init init_profile_hash(void)
{
struct crypto_shash *tfm;
if (!apparmor_initialized)
return 0;
tfm = crypto_alloc_shash("sha1", 0, 0);
if (IS_ERR(tfm)) {
int error = PTR_ERR(tfm);
AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
return error;
}
apparmor_tfm = tfm;
apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);
aa_info_message("AppArmor sha1 policy hashing enabled");
return 0;
}
late_initcall(init_profile_hash);